Just in case, I’m not the type that gets anxiety attack about a guy coming between yuri.
It’s just that these two don’t have enough scenes to make them go head over heels for him. Even in this chapter Tsubomi still think of him as a “classmate boy”.
As for the orgy... well, it must happen for fan service, non-negotiable.
Simply glad that the author didn’t have to make all of them fall in love.